Bluetooth 5.0 Transmitter Receiver 2 in 1 3.5mm AUX RCA Wireless Bluetooth Adapter for Home Stereo Audio TV PC Car Tablet Headphone - Digital Optical Low Latency HD Sound

??Specifications? Model: KN321 Technologies: BT5.0, A2DP, AVRCP (receiver mode only) Operation Range: Up to 10m / 33ft (without any blocking objects) Charging Time: 2 hours Battery Type: Li-Polymer (200mAh) Dimensions: 44 × 44 × 12mm  Weight: 18g ??Package Content? 1x Bluetooth 5.0 Audio Transmitter/Receiver Adapter 1x Micro USB Power Cable 1x RCA Cable 1x 3.5mm Aux Cable 1x User Manual ??Mode description? 1. Power on: Press and hold the power on/off button until the LED lights up 2. Shutdown: Press and hold the power on/off button until the LED is off  3. Charging: Use the DC-5V charger and micro usb charging cable. The red light is on during charging. When the battery is fully charged, the blue light is on. 4. Switch mode: 1)RX: Receive mode, indicator: blue LED 2)TX: Transmit mode, indicator light: red LED 5. RX mode: Pairing name: KN321, find KN321 in the Bluetooth settings of the phone to pair. The blue light flashes twice a second during the pairing process, and the blue light flashes once every three seconds after the pairing is successful.  6. TX mode:  TX mode will automatically search for other Bluetooth receiving devices (such as Bluetooth headset, Bluetooth speaker, Bluetooth receiver, etc.), The red light flashes twice a second during the pairing process, and the red light flashes once every three seconds after the pairing is successful.  ??How to use? 1. Plug one end of the audio cable into the audio output of the devices and the other end into the audio of the KN321. 2. Confirm that it is in TX mode (red light flash). The KN321 will automatically search for Bluetooth headset or Bluetooth speaker pairing.